How to preserve soybean flowers and increase pod set? A detailed explanation of chemical regulation management techniques

1. Applying rare earth

Rare earth is also called rare earth micro-fertilizer or rare earth nitrate, with the trade name Changle Yizhisu. It is a new type of rare@#@258@#@element fertilizer first developed and promoted as a key project in China; at the soybean seedling stage and early flowering stage, spraying once each with rare earth solutions at concentrations of 0.03-0.04% and 0.08% respectively can increase grain protein content by 5.9%, fat content by 8.5%, and yield by 15%-20%.

2. Applying paclobutrazol

Paclobutrazol is also called chlorobutrazol, code PP333, and is a new type of plant growth regulator; when applied to soybeans, it can dwarf the plants, thicken the stems, shorten the petioles, extend the functional period of the leaves, help ventilation and light penetration and prevent lodging, and can also control soybean mosaic virus, generally increasing yield by about 20%. Application method: from soybean branching to early flowering stage, spray 25 kg of 250 ppm paclobutrazol solution per mu.

3. Applying sodium bisulfite

Sodium bisulfite is a photorespiration inhibitor. When applied to soybeans, it can effectively reduce plant respiration intensity, decrease dry matter consumption, and increase yield by an average of 10.5%. Application method: use 8 g of sodium bisulfite per mu, dilute with 50 kg of water, and spray once each at the early flowering stage and full flowering stage of soybeans.

4. Applying triiodobenzoic acid

According to experiments, at the early flowering and full flowering stages of soybeans, spraying once each with solutions at concentrations of 100 ppm and 200 ppm respectively, 50 kg per mu each time, can increase the number of flowers by 25-40%, reduce the flower and pod abscission rate by 7%, increase the number of pods per plant by 5-12.6, increase 100-grain weight by 0.5 g, promote early maturity by 5-7 days, and increase yield by 5-23%; foreign reports indicate yield increases of 10-50%.

5. Applying yield-increasing agent

Yield-increasing agent is also called 4-iodophenoxyacetic acid, and is a plant growth stimulant; at the full flowering to pod-setting stage of soybeans, spray once every 7-10 days with 20-30 ppm yield-increasing agent solution, for a total of 2 sprays, 50-75 kg per mu each time, which can increase the number of flowers per plant by 20%, reduce the flower and pod abscission rate by 10%, and increase yield by 3-15%.